Administration of the MapR-DB is done primarily via the command line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR-DB table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR-DB administration is associated with tables, columns and column families, and table regions.

The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.

1. Restore ZooKeeper

If the CLDB node that failed was also running ZooKeeper, install ZooKeeper on another node
to maintain the minimum required number of ZooKeeper nodes. Before installing ZooKeeper on
another node, ensure that the ZooKeeper role is deleted on the failed node. See Removing ZooKeeper Role for more
information.